2 * blktrace support code for fio
8 #include "blktrace_api.h"
10 static int discard_pdu(int fd, struct blk_io_trace *t)
15 if (lseek(fd, t->pdu_len, SEEK_CUR) < 0)
21 int is_blktrace(const char *filename)
23 struct blk_io_trace t;
26 fd = open(filename, O_RDONLY);
28 perror("open blktrace");
32 ret = read(fd, &t, sizeof(t));
36 perror("read blktrace");
38 } else if (ret != sizeof(t)) {
39 log_err("fio: short read on blktrace file\n");
43 if ((t.magic & 0xffffff00) == BLK_IO_TRACE_MAGIC)
49 static void handle_trace(struct thread_data *td, struct blk_io_trace *t)
53 int load_blktrace(struct thread_data *td, const char *filename)
55 struct blk_io_trace t;
58 fd = open(filename, O_RDONLY);
60 td_verror(td, errno, "open blktrace file");
65 int ret = read(fd, &t, sizeof(t));
68 td_verror(td, errno, "read blktrace file");
72 } else if (ret != sizeof(t)) {
73 log_err("fio: short read on blktrace file\n");
77 if ((t.magic & 0xffffff00) != BLK_IO_TRACE_MAGIC) {
78 log_err("fio: bad magic in blktrace data\n");
81 if ((t.magic & 0xff) != BLK_IO_TRACE_VERSION) {
82 log_err("fio: bad blktrace version %d\n", t.magic & 0xff);
85 ret = discard_pdu(fd, &t);
87 td_verror(td, ret, "blktrace lseek");